The fass is a confusing item. It is available in 2 series - 150 and 95. Now, each is available in 3 flow rates - 95, 150, and 200. The 95 Series is a little smaller, lighter, and slightly cheaper than the 150 Series.
So, you get a 95/95, 95/150. 95/200, ect.
Regardless of mods, either the 95/95 or 150/95 95/150 or 150/150 will work fine for you.
I am sure that confused the heck out of you!
AS for your VP44, there are 2 options. A reman unit rebuilt to spec, or the HRVP44 listed above, which fuels a little harder and has a little timing built in. Downside to it is on some trucks it has a slight lope, which is harmless, but can be somewhat annoying to some folks.
I heard the VP44 from bosch with the FASS system but i havent heard anything for the second pump...
The pumps listed above are all you need, and you need one of each (VP44 and FASS):thumbsup